Abstract
The electronic structure of single-strand DNA was studied by resonant photoemission spectroscopy at C1s and N1s resonances to understand the charge transfer process in DNA. The intensity enhancements of valence electrons were clearly observed at both C1s and N1s resonances although they emerged at different regions of the valence band at each resonance. These observations provide direct evidence for the localized nature of the unoccupied states in the nucleobases and backbone, and support the validity of the charge hopping model in long-range charge migration in DNA.
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